Should the definition not be
  \define[1]\anios{{\tfx \inmagin{#1}}}
…………………………\inmargin….?

Alan


On Wed, Jul 17, 2013 at 6:59 PM, Andres Conrado <elandi@chiquitico.org>wrote:

> Hello, list. Also posted this to:
>
> http://tex.stackexchange.com/questions/124494/simple-macro-does-not-work-with-context-why
>
> ConTeXt version: 2013.06.10 22:51
>
> MWE:
>
> %%%%%%%%%%%%%%%%%%%%%%%
>     \define[1]\anios{{\tfx \inmagin{#1}}}
>
>     \starttext
>     {\tfx \inmargin{2008-2012}}This is what has been done so far in
> this years. % this works...
>     \anios{2008-2012}This is what has been done so far in this years.
> % this doesn't work...
>     \stoptext
> %%%%%%%%%%%%%%%%%%%%%%%%
>
> Error message:    system          > tex > error on line 5 in file
> [...]/MWE.tex: Undefined control sequence ...
>
> Any ideas? Maybe is something stupid, but it doesn't work. I have
> other `\define` commands in the same file and they work very well.
>
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